What Is A Needle Valve?
What Is A Needle Valve? The valve plug of the needle valve is needle-like, and the seal between the valve stem and the seat is realized through the bellows, which can move along the direction of the water flow and change the area of the flow break, so as to adjust the flow rate. Needle valve has the advantages of high adjustment precision, good wear resistance, simple structure and flexible operation. Due to its special structure and working principle, the needle valve has a good linear adjustment ability and can fine-adjust the flow rate in a small range. Needle valve seats are usually made of soft materials, such as tin, copper, etc., to ensure sealing performance. The seal between the stem and the seat is achieved by bellows. When regulating the flow, the control needle is gradually inserted or withdrawn from the seat by rotating the valve stem to control the flow of the fluid. The valve is needle-shaped and moves along the flow direction to change the flow a...